| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.location.gnss; |
| |
| import static com.android.server.location.gnss.GnssManagerService.D; |
| import static com.android.server.location.gnss.GnssManagerService.TAG; |
| |
| import android.annotation.Nullable; |
| import android.app.AppOpsManager; |
| import android.location.IGnssNmeaListener; |
| import android.location.util.identity.CallerIdentity; |
| import android.util.Log; |
| |
| import com.android.internal.listeners.ListenerExecutor; |
| import com.android.server.location.gnss.hal.GnssNative; |
| import com.android.server.location.injector.AppOpsHelper; |
| import com.android.server.location.injector.Injector; |
| |
| import java.util.Collection; |
| import java.util.function.Function; |
| |
| /** |
| * GNSS NMEA HAL module and listener multiplexer. |
| */ |
| class GnssNmeaProvider extends GnssListenerMultiplexer<Void, IGnssNmeaListener, Void> implements |
| GnssNative.BaseCallbacks, GnssNative.NmeaCallbacks { |
| |
| private final AppOpsHelper mAppOpsHelper; |
| private final GnssNative mGnssNative; |
| |
| // preallocated to avoid memory allocation in onReportNmea() |
| private final byte[] mNmeaBuffer = new byte[120]; |
| |
| GnssNmeaProvider(Injector injector, GnssNative gnssNative) { |
| super(injector); |
| |
| mAppOpsHelper = injector.getAppOpsHelper(); |
| mGnssNative = gnssNative; |
| |
| mGnssNative.addBaseCallbacks(this); |
| mGnssNative.addNmeaCallbacks(this); |
| } |
| |
| @Override |
| public void addListener(CallerIdentity identity, IGnssNmeaListener listener) { |
| super.addListener(identity, listener); |
| } |
| |
| @Override |
| protected boolean registerWithService(Void ignored, |
| Collection<GnssListenerRegistration> registrations) { |
| if (mGnssNative.startNmeaMessageCollection()) { |
| if (D) { |
| Log.d(TAG, "starting gnss nmea messages collection"); |
| } |
| return true; |
| } else { |
| Log.e(TAG, "error starting gnss nmea messages collection"); |
| return false; |
| } |
| } |
| |
| @Override |
| protected void unregisterWithService() { |
| if (mGnssNative.stopNmeaMessageCollection()) { |
| if (D) { |
| Log.d(TAG, "stopping gnss nmea messages collection"); |
| } |
| } else { |
| Log.e(TAG, "error stopping gnss nmea messages collection"); |
| } |
| } |
| |
| @Override |
| public void onHalRestarted() { |
| resetService(); |
| } |
| |
| @Override |
| public void onReportNmea(long timestamp) { |
| deliverToListeners( |
| new Function<GnssListenerRegistration, |
| ListenerExecutor.ListenerOperation<IGnssNmeaListener>>() { |
| |
| // only read in the nmea string if we need to |
| @Nullable private String mNmea; |
| |
| @Override |
| public ListenerExecutor.ListenerOperation<IGnssNmeaListener> apply( |
| GnssListenerRegistration registration) { |
| if (mAppOpsHelper.noteOpNoThrow(AppOpsManager.OP_FINE_LOCATION, |
| registration.getIdentity())) { |
| if (mNmea == null) { |
| int length = mGnssNative.readNmea(mNmeaBuffer, |
| mNmeaBuffer.length); |
| mNmea = new String(mNmeaBuffer, 0, length); |
| } |
| return listener -> listener.onNmeaReceived(timestamp, mNmea); |
| } else { |
| return null; |
| } |
| } |
| }); |
| } |
| } |